Improvement in hand drilling-machines



l. C. CHAPMAN.

Hand-Drilling Machines. No,.157,373. Patented Dec.1,1a74.

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UNITED STATES PATENT OFFICEc JOHN C. CHAPMAN, OF PASSAIO, NEW JERSEY.

IMPROVEMENT IN HAND DRILLING-MACHINES.

Specification forming part of Letters Patent No. 157,373, dated December1, 1874; application filed September 14, 1.874.

To all whom t may concern:

Be it known that I, JOHN C. CHAPMAN, of Passaic, in the-county ofPassaic and State of New Jersey, have invented certain Improvements inHand Drilling-Wlachines, and I hercby declare the following to be afull, clear, and exact description thereof, reference being had to theaccompanying drawings making a part of this specification, in which-Figure l is a front elevation. Fig. 2 is a side elevation. Fig. 8 is avertical section through the spindle. Figs. .4, 5, and 6 are details tobe referred to.

In drilling-machines now in use many disadvantages are apparent. rIheyarise principally from inefficient means of adiustment, and a lack of anautomatic intermittent feed.

The object of my invention is to overcome these disadvantages; and itconsists in certain details of improvement, as more fully hereinafterdescribed.

. it out.

The construction of my machine is as follows: The bar or arm forcarrying the drillspindle is rectangular, and is itted into acylindrical piece, A, which rests in a bearing, B, on one of thequadrants, P. The other quadrant, D, is secured to P by the binding-boltE, and both together may be revolved about the standard C, the standardC being fastened or secured to any piece of work. The drillspindle maybe brought to any required position by movin gthe pieceD horizontallyaround the standard O, and revolving the piece A in its bearing, asrequired, and the bearing B may be swiveled to any angle in the verticalplane, and then secured by the binding-bolt E. The piece B is divided onone side of the cylinder, and has ears and a binding-screw to hold'thecylinder A in position.

The automatic feed is composed of several parts, and is operated by therevolution of the drill-spindle. The spindle is surrounded by a sleeve,H, having a screw on its outer surface, and at its upper end a wheel,H', with an internal ratchet, as seen in Fig. 5. The arm or bar Gistapped out to receive the screw of the sleeve H, surrounding thespindle, and as the spindle is revolved it operates an eccentric, I, andstrap J, the strap having a tooth, J', projecting from its outersurface, and engaging with the teeth of the ratchet H'. The eccentrichas also a pin,K, on its top side, working into a slot in the piece L.The piece L is held at one end by passing around the spindle, and at theother end by a small rod, L', which keeps it in place to guide theeccentric strap.

The use of the slot and pin K is to allow the strap J an oscillating andlimited rotary motion, so as to intermittently turn the wheel H' bymeans of the tooth J', which engages with the ratchet-wheel at eachrevolution of the spindle. By this turning ofthe wheel H', thescrew-sleeve H is gradually fed forward, and the drill on the end of thebar S advanced to its work.

Havingthus described my inventiomwhat I claim as new, and desire tosecure by Letters Patent, is-

l. The screw-sleeve H, bearing the ratchetwheel H', in combination withthe spindle S, eccentric I, strap J, bearing the tooth J' and pin K, andslotted piece L, all constructed and operated substantially as setforth. l

2. The quadrant D, provided with the clamp D', and quadrant P, providedwith the clamp B, in combination with the standard O, cylinder A, andbar Gr, as described, for the purpose specified.

JOHN O. CHAPMAN.

